It was revealed last week that Chelsea were chasing the 17 year-old striker, but it's emerged Benfica are also keen.

Libertad president Carlos Guggiari admits Benfica had made a move for Caballero: "I know there are conversations between agents and the father, who is also the representative of the player. We are in expectation of receiving an approach or a formal proposal soon."

Guggiari sees Caballero in the same class as Oscar Cardozo "but he is faster".